Feed-reversing



(No Model.)

G. Q. WHITNEY. FEED REVERsING ATTACHMENT FOR LATHES. No. 395,531. Patented Jan. 1, 1889.

, rocker.

llnirnn Stains GEORGE Q.

arnnr rricn.

FEED -REVERSING ATTACHMENT FOR LATMES.

SPECIFICATION forming part of Letters Patent No. 395,581, dated January 1, 1889.

Application filed Angnst- 21, 1888. Serial No. 283,329. (lilo model.)

versing Attachments 'li'or Lathes, oi which the 1 following is a full, clear, and exact descrip tion, whereby any one skilled in the art can make and use the same.

The object of. my in vcntion is toprovide in 5 rocker will project through it into the right a lathe a gearshifttn: that shall be simple in construction and perfect inv operation, while reducing the number of parts and the need of great accuracy oi. workmanship in fitting parts that belong to gear-shifters ot the prior art.

My invention consists in the combination of a slotted shitter-spimlle borne in a socket in the lathe-head and a rocker bearing the usual gears and apin that engages the slot in the shifter-spindle. i

It further consists in the combination of the slotted shifter-spindle having a threaded end, the spindle-socket threaded for part of its length in the lfltl'lG-llfitttl, and the rocker with the pin engagin the cam slot in the spindle.

It further consists in details of the several parts making'up the gear-shifting mechanism and their combination, as more particularly hereinafter descrilnnl, and pointed outin the claims.

Referring to the drawings, Figure l is a view in side elevation of a lathe-head. Fig. 2 is a detail view, in vertical crosssection, ot' the head on enlarged scale. tail view, in horizontal section, of part of the head on the plane of the axis of the shifter spindle. Fig. 4 is a detail edge view of the On this shaft, and preferably on the inncri side of the end wall, (1, ol. the head,

mounted a rocker, d, by the side of the gear- 1 wheel e, fast to the shaft 0, and on the outer end of the rocker are also mounted the two gear-wheels f and f, that are respectively in gear with the center wheel, 2. On the back 1 3 is a de- Fig. 5 is a detail view of the spiral of the rocker is a pin, (7, that extends into the cam-slot g in. the shifter-spindle g, that is located. in socket in the lathe-head a.

end, of the spindle is threaijlcd to lit the threaded socket in the head, the end wall of which cut away, so that the pin (Z on the siiral roove or cant-slot in the shifterspindle. A handle, 9, is secured to the outer end of the shitter-spimille in a position easy of access from the front of the lathe, and is preferably so secured to the spindle that it will stand in a vertical position when the spindle-gear l) is out of engagement with the rocker-gears. The latter may be thrown into engagement with the spindlegcar by a partial rotation ofthe spindle that turns the handle aside, the position of the handle indicating to the workman at a glance the engagement or non-engagement of the rocker and spindle gears.

The threaded end of the spindlegear, fitting, as it does,in a threaded socket, provides means for holding the spindle against sidewise play, (except, of course, such as is due to the rotation of the spindle,) and also provides means of getting a quick throw of the rocker with less pitch to the oanrslot and in a half-revolution of the spindle. slot preferably terminates in a straight part, with walls at right angles to the axis of the spindle that forms a locking socket and serves to hold the rocker when the gears are engaged against accidental movement out of 0 engagement.

It will be seen that my gear-shifter with parts as above described is simple in construction, positive in operation, and can he made and fitted to the machine by simple tools and 5 The camin the shifter-spindle, the shifter-spindle having the cam-slot and having rotary movement in the socket in the lathe-head all substantially as described.

2. In combination Witha lathe-head or like part of a machine-tool, a live-spimlle and a feed-shaft mounted in the head, the rocker loosely mounted on the feed-shaft and hearing the rocker-gears, the pin projecting from the rocker-arm, the shilter-spiinlle having a ca1n-slot for the reception of the pin on the rocker, and a threaded end fittin g i he threaded socket in the head all substantialI as described.

3. In a lathe-head gear-shifter, in combination with the rocker bearing the rocker-gears and a projecting pin, a rotary shifter-spindle GEOR :E Q. WHITNEY.

\Vitnesses:

CHAS. L. BURDETT, L. E. RHODES. 

